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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>10-高阶函数</title>
</head>
<body>
    <script>
        function highOrder(x,y,callback){
            console.log(x+y);
            callback&&callback();
        }

        highOrder(1,2,function(){
            console.log('轮到我了...');
        });
    </script>
</body>
</html>